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Impreza has still been wandering a bit so I wanted to replace a couple of the lateral link bushings and CV boots. Got a bunch of Group N bushings so I'd have some on the shelf for future repairs. With the billet knuckles and dog leg trailing arms and the stainless studs in place of the long bolts it's a much easier job than it used to be, didn't take me long to get both axles out. One thing I've been wanting to address almost from the beginning of this swap is the slop in the rear diff stubs. The combination of slop in the diff splines and the splines for the female axles allows the inner CVs to move around more and have more backlash than normal. The splines for the inner CV were worn on the stubs that have been in the car for a couple years now. I peened a pair of them like the one in the bottom of this picture. I tried pressing them first to squish the splines but that did nothing. This may not last long as a means of reducing the slop but I figured it was worth a try. B swapped out a couple of the lateral link bushings and cleaned up the long studs. He also shorted a couple of the inner bolts that were rubbing on the inner CV boots. I regreased and rebooted a couple CVs and replaced one axle. Once we got it all back together one CV had basically no slop on the splines, the other one still had some but less than before. While we were under there I decided to refab the section of exhaust that hangs under the subframe. Cut out that flattened section and replaced with 2.5" x .095" 4130. Actually has clearance to the CV joint now. We also came up with an initial plan for mounting the extra fuel tank. Can't wait to get that hooked up. B unbolted the top of the radiator and pulled it back the little it can move with the radiator hoses on it, then he blasted a bunch of crap out from between the radiator and condenser with compressed air. I want to get/make some different nozzles for doing that more effectively, should probably at least check that regularly. Still hoping that getting the puller fans on the primary fan circuit and the pusher fans on the secondary fan circuit will help.

Just posting an update in case anyone else runs into this. As I said earlier My 83 Brat had a Nippondenso distributor [Cardone 31-812]. I swapped it out with a Hitachi [Cardone 31-810]. This solved the problem with losing spark at 2-2500 RPM. Thanks to all who gave advice.